Sieve the flour and baking powder together. Place the eggs, yoghurt, olive oil and paprika in a large bowl. Whisk with a whisker until you have a homogenous mixture, then, add the feta cheese and stir. Add the flour, a little at a time and combine everything using a spoon or with your hands. Grease with olive oil and dust-flour a 36cm shallow baking pan. Empty the lot in and smooth it over with the back of a spoon. Place the pan on the bottom shelf of a preheated oven and bake at 180ºC for 45 minutes, until golden and crispy.